Application of gallic acid and xanthene dyes for determination of ozone in air with a chemiluminescence aerosol detector Original Research Article

A fast and sensitive determination of gaseous ozone based on a chemiluminescence reaction with gallic acid and xanthene dyes in the chemiluminescence aerosol detector is described. An optimum reagent solution consists of 0.001 M gallic acid and 0.001 M eosin Y in 10% (v/v) diethylene glycol. The primary chemiluminescence reaction takes place between ozone and gallic acid while eosin Y acts as a sensitizer and diethylene glycol as a modifier. A detection limit of ozone is 0.3 ppb (v/v) and a calibration curve is linear in the range of ozone concentrations 1.4–349 ppb (v/v). Nitrogen dioxide, peroxyacetyl nitrate, formaldehyde, peroxoacetic acid and nitric acid do not interfere. The method, due to its favourable analytical parameters, e.g. linear response and high sensitivity and selectivity, could be used for monitoring of ambient ozone.